public void execute_logs_a_step_result_error()
        {
            var context = SpecContext.ForTesting();

            var step = new InvalidGrammarStep(new StepValues("the id"), "grammar is wonky");

            step.Execute(context);

            var result = context.Results.Single().ShouldBeOfType<StepResult>();

            result.id.ShouldBe("the id");
            result.status.ShouldBe(ResultStatus.error);
            result.error.ShouldBe("grammar is wonky");
        }